Stamp mill



STAMP MILL 2 Sheets-Sheet 1 Filed Oct. 19, 1951 Q Q Ma INVENTOR.

Sept. 14, 1954 s. ZADERENKO STAMP MILL 2 Sheets-Sheet 2 Filed Oct. 19, 1951 m m m m Patented Sept. 14, 1954 UNITED STATES PATENT OFFICE STAMP MILL Sergio Zaderenko, New York, N. Y.

Application October 19, 1951, Serial No. 252,037

4 Claims. r1-

My invention relates to improvements in stamp mills and the like.

One of the objects of the invention is the provision of an improved rotary and reciprocating device in connection with the drive of the drop hammer member in a stamp mill.

A further object of the invention is the improvement of the feed and discharge to such mills including adjustable discs with openings therein in the feed and a cylinder with rows of openings and having closure bands extending thereabout in the discharge. These devices facilitate control of the feed and fineness of the grind in such mills.

This invention is illustrated in the two sheets of drawings as follows:

Figure 1 shows a vertical sectional view of the mill taken on a plane through -0 of Figure 3 showing the lower grinder element 2 as stationry;

Figure 2 shows a connecting drilling rod assembly;

Figure 3 shows a horizontal plan view of the mill in Figure 1 (to the right) and cross-section on plane AO (to the left) Figure 4 shows a horizontal cross-section through plane B--B of Figure 1 with the extraction holes and the drop hammer in the raised position;

Figure 5 shows a detailed view of the air connection; and,

Figure 6 shows a modified grinder in vertical section wherein the bottom grinder element has a rotating movement opposite to the rotary movement of the upper grinder element.

The stamp or vertical grinder mill illustrated in Figure 1 includes a stationary grinder or millstone 2 having legs 26 fastened to a base or support by bolts 49. A vertical tubular stationary cylinder 4 surrounds the stationary grinder and is joined thereto by the pin 48. Surrounding the upper end of the cylinder 4 and, attached thereto by welding are bearing members 20 and 2| and supports I8 (bearing member 20 is rotative, not welded). The rotary drop hammer comprising another vertical tubular cylinder 3, with a grinding hammer or stamp I, fixed to its lower end, is situated in cylinder 4 being suspended elastically on the upper bearings 20 and 2I by means of a seat 6 and elastic elements 22 which may be springs or rubber elements. v The rotary drop hammer is given both a rotary and a reciprocating movement simultaneously by the following mechanism: a driving shaft 8 and rod 9 are connected to the rotary drop hammer and supported in bearing I0 attached to the cross bar or cross plate seat I3 which, in turn, is guided by guide screws I6 and guide pins I5. The coupling plate 'I connects the shaft 8 to the cylinder 3 of the drop hammer. The guide screws I6 are soldered to the supports I8 which are in turn soldered to the stationary part of the machine, specifically the upper part of cylinder 4. On the seat 6 is fixed an annular cam washer 5 which operates pusher rollers II on shafts 52 which are supported from above by bracket I2 and guide pins I5 which extend through said bracket I2 and are soldered to the cross plate seat I3. Between the brackets I2 and the seat I3 are additional elastic elements I4, such as rubber blocks or springs similar to elements 22. The rollers are held into engagement with the cam washer by the elastic elements and as the drop hammer is rotated together with the cam washer the rollers cause the drop hammer to reciprocate vertically. The ground product is discharged from between the grinder members through annular spaced rows of openings in the fixed cylinder 4 and into a collector comprising a bell 35 resting on the supports I8 and having its bottom connected to the top of a funnel I! placed on the lower end of cylinder 4 and resting on the legs 26. The bell 35 and funnel I! are joined together by screws 36.

In the operation of the machine, the ore to be ground falls from the hopper or chute 29, Figures 1 and 3, and passes downwardly through holes in the plate I, filling the cylinder 3 and partially filling the space between the grinder elements I and 2 after moving through holes in the grinding hammer I. When starting the nuts I6 are loosened to aid the fiow of material to between the grinding faces and the rod 9 is rotated by conventional means not shown. As the rod 9 rotates, the shaft 8 turns in its bearing I0 rotating the drop hammer with cylinder 3, grinding hammer I, fiange 6, cam washer 5, rubber elements 22 and antifriction washer bearing 20, the latter moving on seat 2|. After the mill has been started the nuts I6 are tightened and the rollers II while rolling on top of cam washer 5 push the drop hammer I downwards compressing the rubber washers 22 causing the grinders to crush the ore located between the hard grooved surfaces of the grinder elements I and 2. These grooves facilitate the feed and grinding of the ore as the upper grinder rotates. As the ore is crushed and ground additional ore falls from cylinder 3 into the space between the grinding members and the feeding thus becomes substantially automatic. In this repeated simultaneous vertical reciprocation and rotation the combined forces of percussion of the rotating drop hammer in its vertical movement and the friction between the relative rotation of the grinding elements, are employed. As the grinding hammer reciprocates air enters the cylinder and is compressed to aid in discharging the ground material which is also urged outwardly by the centrifugal action of the rotating grinding member. The ground material is discharged through holes in the lower part of cylinder 4 and falls into the collector l1 and 35 and falls down through other openings in the lower end of grinder element .2 to a canal or duct at the base and from there to containers.

The feed can also be regulated by means of a rod 23 with two plates 21 and 28 soldered to its ends. The bottom plate has holes thereth-r-ough of the same size as the holes in the grinding member I and the top plate has teeth :a on its periphery to rotate the device and a series of holes for the pin 50 to lock the plates and rod in adjusted positions. By regulating the admission holes to the upper grinder member I by means of the lower plate the desired feeding of the ore is obtained.

Rod 23 is used as an auxiliary air conduit should it be desired to inject air into the grinding chamber to regulate the fineness of grind.

The regulation of the fineness of grind is accomplished in the following manner:

1. By using the various rows of extraction holes in the cylinder '4 and covering the unused holes with collars consisting of an elastic belt 48 fastened by a metallic band [9 closed by means of bolts as shown in Figure -1.

2. By the injection of auxiliary air into the space between the grinding faces I and 2 or drawing air at the desired pressure from a device such as is shown in Figure 5 combined with Figure 1 wherein Figure 5 shows a telescopic well adjusted tube 5| provided with catches and labyrinths, a double conical joint 34, an attaching support 38 and-a pulley 39 fora trapezoidal transmission belt.

3. By regulating the movement of the drop hammer through the adjustmentof nuts I 6 which provides different degrees of tension in the shock absorber yielding rubber members i4 and 22.

With the above regulation the fineness of grind can be regulated from that of coarse grains to any desired, siz of fineness.

In my device the bearings and guides are lubricated through channels 41 and the rollers rotate in a receptacle of oil in protected from loss, dust or other foreign matter by protectors 24 and 25. Elements such as 3-! and 38 are provided to counteract the centrifugal displacement of the oil in the receptacle and similar means counteract displacement of the ore in the upper part of cylinder 3.

In Figure 6 is shown a modification of the grinder machine wherein the lower grinder element 2 is given a rotary movement in the opposite direction from the direction of rotation of grinder element 1. In this modification the grinding element 2 is provided with a bearing 44 and shock absorbing element 45. The grinding element 2 is mounted on a stationary base 43 and has a driving shaft 41 with its bearing 42. This type of machine because of its increase of relative speed of the grinding surfaces, has a greater yield of ground product than that of the machine of Figure 1 The rotative movements of the grinder elements are indicated by arrows in Figure 6. It may be further noted that in the lower part of the mill of Figure 6, the upper grinder I is provided with only one central feed hole, the lower grinder 2 has no outlet holes in its lower end, and the funnel I1 is of different design. The funnel has a protector against the escape of dust in the space between the stationary funnel and the grinder 2, and its lower part is shaped to provide several hoppers or chutes to discharge the ground ore. The cylinder 4 remains stationary with the supports 18 screwed to the foundation by anchoring bolts 31. Each row of extraction holes in the cylinder 4 has its individual closure collars l9 and 40.

To obtain simultaneously rotating and reciprocating movements, other devices can be used, for example: eccentric action cam, spindle, vibrating and pneumatic mechanisms, etc.

The same rotating and reciprocating movement combination may be used to advantage in other machines. For example, perforators, agitators, mixers, etc.

As an example of the use of such movement in other type machines, Figure 2 shows schematically the connection of a drill 32 placed in .its guide 30, moved by rotary reciprocating drop hammer, which simultaneously compresses the air introduced by valve 33 sending it through the channel "0 to the drilling point of the drill.

I claim:

1. In a stamp mill type grinder, the combination of a frame, an upper drop hammer grinding element and a lower grinding element in vertical alignment with the drop hammer grinding element, a driving shaft fixed centrally to the drop hammer and extending vertically upwardly, means to rotate the driving shaft, a cross bar at the top of the mill having a bearing for said shaft, means on the outer ends of said bar for adjustably attaching the bar .to the frame, a cylinder attached to the drop hammer grinding element and extending upwardly in coaxial relation with the shaft, a frame cylinder in bearing relation therewith, a ring plate having an annular cam on its upper surface, said ring plate having its inner annular edge fixed to the upper end of the first cylinder, elastic elements between the upper end of the frame cylinder and the lower surface of the ring plate, additional elastic elements located beneath and contacting the cross bar, aplate bearing against the lower surface of the additional elastic elements, means supporting said plate against rotation and in vertically slidable relation relative to the cross bar, pressure rollers attached to the plate and rolling on the annular cam, said cam providing with said rollers the vertical movement of the drop hammer grinding element and said grinding element being cushioned in its movement by the upper and lower shock absorbing elastic elements, an extension cylinder 'on the upper end of the first cylinder, the drop hammer grinding element being provided with passages extending therethrough to allow feed of material to be ground to pass from the top of the mill through the cylinders to beneath the drop hammer-grinding element on to the lower grinding element.

2. A mill as setforth in claim 1 and means to rotate the lower grinding element on a vertical axis coaxial with the drop hammer grinding element in the opposite direction from that of the drop hammer grind-ing element.

3. A mill as set forth in claim 1, wherein fixed cylinder is provided with spaced rows f Open- References Cited in the file of this patent UNITED STATES PATENTS Name Date Lipsey June 3, 1879 15 Number Number Number Name Date Gawley Oct. 17, 1916 Hamey May 3, 1927 Hamey Aug. 6, 1929 McKeever Sept. 26, 1939 FOREIGN PATENTS Country Date Great Britain Dec. 29, 1914 

